Quantum trajectories for realistic photodetection: II. Application and analysis.

摘要: In the preceding paper (Warszawski P and Wiseman H M 2002 J. Opt. B: Quantum Semiclass. 4 1) we presented a general formalism for determining state of quantum system conditional on output realistic detector, including effects such as finite bandwidth electronic noise. We applied this theory to two sorts photodetector: avalanche photodiodes photoreceivers. present simulations these trajectories cavity electro-dynamics scenario in order ascertain how conditioned varies from that obtained with perfect detection. Large differences are found, is manifest average purity. Simulation also allows us comprehensively investigate quality photoreceiver (PR) depends upon its physical parameters. particular, evidence limit small noise, PR can be characterized by an effective bandwidth, which level noise filter bandwidth. establish result appropriate simpler, analytically solvable, system. expect other applications our theory.